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"All editions of Windows Vista will ship on the same DVD. It is the license
key purchased that determines which version will be installed. After the
product key is entered, the user will choose whether to install the 32-bit
or 64-bit version of that edition (except for Starter edition). The features
of the Home Premium and Ultimate editions may be "unlocked" at any time by
purchasing a one-time upgrade license through a Control Panel tool called
Windows Anytime Upgrade. The Business edition will also be upgradable to
Ultimate. Such licenses will be sold by Microsoft's partners and OEMs, but
not directly by Microsoft "